Sex offender attacks girl, 15, ONE DAY after his release from prison... and his family warned that it would happen

Sex offender: Kevin Long had been released from an eight year prison term less than 24 hours before the attack

A sex offender in California allegedly attacked a 15-year-old girl on a bus just one day after he was released from prison.

Kevin Michael Long, 37, allegedly groped the girl on a bus in Modesto on Tuesday after making crude comments to her -- but was pulled away and held for police by three homeless men who witnessed the assault.

Long has been in and out of prison for most of his life and even his family urged the state of California not to release him.

His family showed KTXL-TV a chilling prison letter Long sent home to his family in which he said he was sexually attracted to children and planned to indulge his predatory urges.

'I know you might be tripping on me and my sexual interest in children. I believe for girls publicly 10 and up and for boys 12 to 14. I have to do some research in candidates,' the letter said.

He also claimed that he was God and that he controlled the government.

Curtis Mitchell and his two friends Joe Barretta and Ken Falls were on the bus with Long when he crudely asked then teen girl if she was a virgin, Mitchell told CBS Sacramento.